“Right now I’m happy doing what I’m doing,” Shatner said. “I’ve been offered many series over the years. But I haven’t done them because of the commitment of time. And at this stage of my life that’s more valuable than anything else.”

That said, the legendary Captain Kirk actor wouldn't necessarily be opposed to making a guest appearance on a Star Trek series. “It will have to pass through enormous hurdles," Shatner said, "including permission from Paramount and then they’ll have to get back to me and see where things are at."

Shatner congratulated Stewart last month on his planned returned to Star Trek in a new series in development for CBS All Access, home of Discovery. The two shared the screen in the 1994 film Star Trek: Generations.